package collection

object CollectionsTest {

    public fun test() {
        filterTest()
    }

    private fun filterTest() {
        val result = listOf(class1, class2).flatten()
            .groupBy {
                "${it.score/10}0分组："
            }
//            .filter {
//                it.score < 60
//            }

        println(result)
    }
}